This land partition had already been legitimized in 1598 by the House Treaty of Gera, which was prepared for this purpose. Christian's assumption of the government of Kulmbach took place at the same time as that of Joachim Ernst in Ansbach. In 1604 Christian moved the seat of power from Kulmbach to Bayreuth and Plassenburg, however Kulmbach was retained as a regional fortress. From that moment, the principality changed its name from Brandenburg-Kulmbach to Brandenburg-Bayreuth.